Pixel Wireless TTL Flash Trigger provides various creative flash functions such as i-TTL, BL and FP at ... flash to execute high-speed synchronous photography, as well various creative flash functions, including l-TTL ,BL, FP and other functions ... -900, SB-800, SB-600, SB-400 flashgun with various creative modes.TR-331 FunctionsSimultaneously control multiple flash or studio lights ...